W.R.A. Co., REM-UMC, Western, and Peters. Smaller outfits, like Robin Hood are out there. Decent, full boxes from the era you mention will be spendy.
Gun Broker is a great place to find them. Use their 'search' devices, save those searches, and check frequently. You can broaden your searches by using different forms of 16 gauge, such as: 16GA, 16 Gauge, 16 GA, etc. Sellers do not use standardized nomenclature when listing their goods. Sometimes a box shows up, and nobody bids on it. Other times, the bidding gets fierce.
Good luck. Cheers!
Here is a 1911-1916 box with nice labels. Unfortunately, and this is common, the 25 rounds are a mixture from other boxes. You can tell by the dished and flat bases on the brass.
http://www.gunbroker.com/Auction/ViewItem.aspx?Item=260406840OWD, in retrospect (as usual!) I wish I had kept my 1923 Ideal with 28" and 32" barrels. The 32" barrels were marked for 3 inch chambers. Both sets, F and F.